深部巷道围岩的分区破裂机制及“深部”界定探讨

ON MECHANISM OF ZONAL DISINTEGRATION WITHIN ROCK MASS AROUND DEEP TUNNEL AND DEFINITION OF “DEEP ROCK ENGINEERING"

通过分析巷道围岩的应力状态和变形破坏多阶段、多水平的性状,揭示巷道围岩最大支撑压力区的体积变形状态及其后果,得出深部围岩区域破裂现象的发生条件、岩体的初始压力和围岩全过程变形状态,尤其是围岩峰值后状态下材料的残留强度关系。根据分区破裂现象的出现条件,提出界定浅部及深部工程活动的标准:浅部工程——坑道最大支撑压力区不破坏的深度;深部工程——坑道最大支撑压力区发生破坏的深度。

By analysing the stress state, deformation and failure of rock mass around tunnels at a variety of stages and at multi-level of stresses, the volumetric deformation state and its consequences are exhibited for the maximum supporting pressure zone. The relationships are derived between the condition for the occurrence of zonal disintegration phenomenon in deep rocks and the initial rock stresses, the total deformation process of rocks, and in special, the residual strengths of rocks at post-peak stresses. According to the condition for the occurrence of zonal disintegration phenomenon, a criterion is proposed for defining the shallow and the deep rock engineering, the shallow rock engineering corresponds to the depth to which the rock mass within the maximum supporting pressure zone does not fail： and the reverse is true for the deep rock engineering.